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7.1
Ubuntu Linux 6.8: Local Privilege Escalation via Garbage Collector
CVE-2025-13350
Summary
A security issue in Ubuntu Linux 6.8 can allow an attacker to gain elevated privileges on a local system. This is due to a bug in the way the system handles certain types of socket connections. To protect your system, update your kernel to the latest version, as newer builds have already fixed this issue.
Original title
Ubuntu Linux 6.8 GA retains the legacy AF_UNIX garbage collector but backports upstream commit 8594d9b85c07 ("af_unix: Don’t call skb_get() for OOB skb"). When orphaned MSG_OOB sockets hit unix_gc(...
Original description
Ubuntu Linux 6.8 GA retains the legacy AF_UNIX garbage collector but backports upstream commit 8594d9b85c07 ("af_unix: Don’t call skb_get() for OOB skb"). When orphaned MSG_OOB sockets hit unix_gc(), the garbage collector still calls kfree_skb() as if OOB SKBs held two references; on Ubuntu Linux 6.8 (Noble Numbat) kernel tree, they have only the queue reference, so the buffer is freed while still reachable and subsequent queue walks dereference freed memory, yielding a reliable local privilege escalation (LPE) caused by a use-after-free (UAF). Ubuntu builds that have already taken the new GC stack from commit 4090fa373f0e, and mainline Linux kernels shipping that infrastructure are unaffected because they no longer execute the legacy collector path. This issue affects Ubuntu Linux from 6.8.0-56.58 before 6.8.0-84.84.
nvd CVSS4.0
7.1
Vulnerability type
CWE-416
Use After Free
Published: 5 Mar 2026 · Updated: 11 Mar 2026 · First seen: 6 Mar 2026